Temat: 63.20.kk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Phonon-Assisted Radiative Recombination of Excitons Confined in InAs Quantum Dashes
Autorzy:: Dusanowski, Ł.
Musiał, A.
Sęk, G.
Machnikowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/1399092.pdf
Data publikacji:: 2013-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.67.Hc
63.20.kk
Opis:: In this report we have investigated theoretically the phonon-assisted recombination process of excitons confined in strongly elongated semiconductor nanostructures, called quantum dashes. Interaction with phonon bath leads to the occurrence of phonon-assisted recombination, which in the case of acoustic phonons is manifested in the optical spectra as a deviation of the homogeneously broadened emission line shape from expected Lorentzian profile via occurrence of the so-called phonon sidebands. Hereby, we have modeled the influence of the quantum dash geometry on this spectral feature proving pronounced suppression of phonon-induced decoherence for strongly elongated nanostructures. Furthermore, the importance of different phonon coupling mechanisms has been evaluated and the spectral diffusion effects, unavoidable in the time-integrated photoluminescence experiments, have been accounted for.
Źródło:: Acta Physica Polonica A; 2013, 124, 5; 813-816
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Bond-Selective Excitation and Following Displacement of Ge Atoms in $GeTe//Sb_{2}Te_{3}$ Superlattice
Autorzy:: Makino, K.
Tominaga, J.
Kolobov, A.
Fons, P.
Hase, M.
Powiązania:: https://bibliotekanauki.pl/articles/1489973.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.47.J-
63.22.Np
63.20.kd
63.20.kk
Opis:: Phase change random access memory devices made from chalcogenides compounds, such as $Ge_{2}Sb_{2}Te_{5}$, have attracted much attention because of their high-speed read-write and low power consumption capabilities. The phase change in $Ge_{2}Sb_{2}Te_{5}$ is thought to be characterized by the displacement of Ge atoms, accompanying relaxation of surrounding Sb and Te atoms. Here we examine a new approach, that is the manipulation of Ge-Te bonds using linearly-polarized femtosecond near-infrared optical pulses. As a result, p-polarized pump pulses are found to be more effective in inducing the precursor of phase change, probably due to the atomic arrangements along the unique axis of the superlattice structure.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 336-339
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Thermal Conductivity of Ce₂Ru₃Ga₉ Compound
Autorzy:: Falkowski, M.
Strydom, A.
Powiązania:: https://bibliotekanauki.pl/articles/1384860.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.cp
63.20.kk
72.15.Eb
72.15.Jf
Opis:: The Ce-based 2:3:9 series of compounds are known for strongly correlated 4f-electron behaviour. Here, we report for the first time a study of the thermal conductivity κ(T) in zero and 9 T magnetic field for Ce₂Ru₃Ga₉ across the temperature range 2 K ≤ T ≤ 300 K. The zero-field temperature dependence of κ(T) exhibits a pronounced maximum, characteristic for metals with large electronic mean free path and towards room temperature κ(T) starts behaving in a manner usually attributed to the enhanced electron-phonon coupling. Based on the Wiedemann-Franz law the electronic and lattice contributions to the thermal conductivity were estimated. In high temperature region a distinct step-like anomaly at T* = 203 K has been observed which signals a putative phase transition, probably of phononic or lattice origin. We furthermore discuss the effect of applied magnetic fields on the thermal transport in Ce₂Ru₃Ga₉.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 240-242
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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